CN112852229A - Aerogel heat-insulation thick middle coating, heat-insulation finish paint, aerogel heat-insulation heat-preservation coating system for buildings and preparation method thereof - Google Patents
Aerogel heat-insulation thick middle coating, heat-insulation finish paint, aerogel heat-insulation heat-preservation coating system for buildings and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a middle coating of aerogel heat insulation thick, a heat insulation finish coat, a aerogel heat insulation and heat preservation coating system for buildings and a preparation method thereof, wherein the coating system is formed by combining the middle coating and the finish coat, the middle coating is a main coating, the nano-silica aerogel with a porous network structure is prepared as main functional powder, and the thickness of a dry film after construction is more than 2 mm; the surface finish coating also takes aerogel powder as a main material. The coating with the thickness of more than 2mm is formed after the middle surface is compounded, and the coating system has extremely high sunlight reflectance, near infrared reflectance and middle and far infrared emissivity and has an excellent heat insulation function. The coating can be suitable for all thermal engineering areas in winter and summer, effectively makes up the limitation of the application range of the reflective heat-insulating coating of buildings, and fully covers the application areas and the application seasons.
Description
Technical Field
The invention relates to a coating, in particular to a thermal insulation coating system for buildings and a preparation method thereof.
Background
At present, an energy-saving coating used for an exterior wall of a building is a reflective heat-insulating coating for the building, and the main working principle is that electromagnetic waves generating energy in sunlight are reflected and scattered as much as possible to reduce the absorption of the building wall body to the sunlight, so that the surface temperature of the exterior wall is reduced.
The prior external thermal insulation or reflective thermal insulation coating for the external wall has various defects in the practical application process:
the reflective heat-insulating coating is limited by regions and seasons;
the external thermal insulation safety of the external wall is poor, and cracking, leakage and even falling into the air easily occur; the external thermal insulation operability of the external wall is poor, and the external thermal insulation operability must reach the specified thickness, at least more than 3 cm; the external wall external insulation cost is high, and multi-layer construction is needed, so that the labor cost is increased; the external wall has poor heat insulation and weather resistance and great efficacy attenuation.
Disclosure of Invention
Aiming at the defects of the existing exterior wall external thermal insulation or reflective heat insulation coating, a new building exterior wall coating scheme is needed.
Therefore, the problem to be solved by the present invention is to provide a aerogel thermal insulation coating system for buildings to overcome the defects of the prior art, wherein the thermal insulation coating system is a coating having dual effects of thermal insulation and heat preservation.
On the basis, the invention further provides an aerogel thermal insulation thick middle coating and thermal insulation top coating of the system and corresponding preparation methods thereof.
In order to solve the problems, the aerogel heat insulation and preservation coating system for the building comprises an aerogel heat insulation thick middle coating and an aerogel heat insulation finish coating, wherein the thickness of a dry film of the middle coating is more than 2mm, the thickness of a dry film of the finish coating is more than 60 microns and less than the weight of the components, and the thickness of the coating system is more than 2 mm.
In order to solve the problems, the aerogel thermal insulation thick floating coat provided by the invention comprises the following components in parts by weight:
further, the aerogel is nano-silica aerogel.
Further, the auxiliary agent comprises a dispersing agent, a wetting agent, a thickening agent, a defoaming agent, a preservative, a pH regulator and a film-forming auxiliary agent.
Further, 0.3-1.0 part of dispersant, 0.1-0.8 part of wetting agent, 0.5-2.0 parts of thickener, 0.2-0.5 part of defoamer, 0.2-0.4 part of preservative, 0.1-0.3 part of pH regulator and 0-2 parts of film-forming additive.
Further, the binder comprises one or more of organic high molecular polymer styrene-acrylic emulsion, pure acrylic emulsion, VAE emulsion, high molecular polymer, inorganic binder silica sol, potassium water glass and lithium water glass.
Further, the material is one or more of light calcium carbonate, talcum powder and mica powder.
In order to solve the problems, the invention provides a preparation method of aerogel heat insulation thick floating coat, which comprises the following steps:
preparing a slurry of silica aerogel;
adding water and the slurry of the silicon dioxide aerogel into a slurry type paint mixing kettle, uniformly stirring, adding the light filler and the binder, and uniformly stirring again;
thickeners and pH adjusters are used to adjust the viscosity and pH to the appropriate range.
Further, the method comprises the steps of adding water and the auxiliary agent into processing equipment, stopping stirring after uniform stirring, adding the aerogel powder, stirring at a low speed until the aerogel powder is melted into a paste, and stirring for 5-10 minutes.
In order to solve the problems, the aerogel heat insulation finish paint provided by the invention comprises the following components in parts by weight:
further, the aerogel is nano-silica aerogel.
Further, the auxiliary agent comprises a dispersing agent, a wetting agent, a thickening agent, a defoaming agent, a preservative, a pH regulator, a film-forming auxiliary agent and an antifreeze agent.
Further, 0.6-1.5 parts of dispersing agent, 0.3-1.0 part of wetting agent, 0.3-0.6 part of thickening agent, 0.3-1.2 parts of defoaming agent, 0.2-0.4 part of preservative, 0.1-0.3 part of pH regulator, 1-2 parts of film-forming additive and 1-2 parts of antifreeze agent.
Further, the organic polymer emulsion comprises one or more of styrene-acrylic emulsion, pure acrylic emulsion, silicone-acrylic emulsion and fluorocarbon emulsion.
Further, the filler comprises one or more of ground calcium carbonate, calcined kaolin, water-washed kaolin, diatomaceous earth.
In order to solve the problems, the preparation method of the aerogel heat insulation finish paint provided by the invention comprises the following steps:
adding water into a disc type dispersing kettle, and adding a dispersing agent, a wetting agent, a part of thickening agent, a defoaming agent and a preservative while stirring;
after stirring uniformly, adding titanium dioxide and filler, dispersing at a high speed for 20-30 minutes, adding slurry formed by aerogel, dispersing at a medium speed for 10-20 minutes, adding high-molecular emulsion, and stirring at a low speed for 10 minutes;
finally, the viscosity and pH are adjusted to the appropriate range using the remaining thickener and pH adjuster.
According to the scheme provided by the invention, the elastic coating is formed by combining the high molecular polymer and the additives such as the silicon dioxide aerogel, the diatomite, the dispersing agent, the wetting agent and the like, so that the anti-cracking capability of the outer wall is greatly improved (thereby improving the phenomena such as leakage and the like) while the heat-insulation function is achieved.
The coating provided by the invention can be directly applied to the surface of putty, the thickness can be reduced, even an insulating layer is omitted, and the self weight of attachments on the outer layer of the wall body is reduced, so that the whole manual construction time and cost are reduced, the risk of falling from high altitude is greatly reduced, meanwhile, the water seepage phenomenon is improved, the heat preservation capability of the wall body is kept for a long time, the repairing is easy, and the problem that the common heat preservation effect is weakened along with the time is greatly improved.
Moreover, compared with the existing external wall energy-saving coating, the coating is only limited to the building reflective heat-insulating coating for blocking solar radiation in summer, and can not be applied to all thermotechnical areas and can not be applied in winter and summer.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific examples.
The elastic outer wall heat insulation coating is formed by improving a formula based on the combination of high molecular polymers, silica aerogel, diatomite and various auxiliaries, has a heat preservation and heat insulation function, and has elastic performance to greatly improve the anti-cracking capability of an outer wall, so that the phenomena of leakage and the like of the existing outer wall heat insulation coating can be effectively improved.
The silicon dioxide aerogel in the scheme is preferably nano silicon dioxide aerogel with very low thermal conductivity coefficient (< 0.018W/(m.K)), and the nano silicon dioxide aerogel serving as the strong hydrophobic nano powder can be fully dispersed and can prevent other substances from entering holes of the water-based paint system, so that the excellent heat insulation performance of the whole product is ensured.
Furthermore, since the silica aerogel needs to be added to a certain amount to form a coating with excellent heat insulation effect, if the silica aerogel is excessively added to the system, the strength, toughness and internal stress of the coating are affected, and the shrinkage cracking phenomenon is generated in the drying process of the coating. Accordingly, the inventor determines the adding proportion of the silicon dioxide aerogel in the external wall heat insulation coating through a great amount of innovative labor, so that the external wall heat insulation coating achieves the optimal balance of performance.
As a composition, the combination of silica aerogel in the exterior wall heat insulation coating and different types and proportions of auxiliaries, powder and emulsion can also influence the basic performance of the exterior wall heat insulation coating, such as: the invention further provides a specific formula with a synergistic effect on the basis of the tank opening effect, the viscosity, the film forming property and the like, so that the exterior wall heat insulation coating has excellent performance compared with the existing product.
Accordingly, the aerogel thermal insulation heat preservation coating system for building that this example provided, this system includes the thermal insulation thick matter floating coat of aerogel and the thermal insulation finish paint of aerogel, and the thermal insulation thick matter floating coat of aerogel forms the floating coat and this floating coat dry film thickness is greater than 2 millimeters, and the thermal insulation finish paint of aerogel forms the top coat and this top coat dry film thickness is greater than 60 microns, and coating system thickness is greater than 2 millimeters.
Preferably, the interior of the middle coating can be designed into a hydrophobic type, and the surface paint layer is a hydrophilic type, so that after a coating system is formed, the surface hydrophilicity can have good stain resistance, the interior is hydrophobic and hydrophobic, and the long-acting durability of the coating can be further improved.
Specifically, the aerogel thermal insulation thick middle coating comprises the following components in parts by weight:
wherein, the aerogel is nano silicon dioxide aerogel.
When the aerogel heat insulation thick medium coating formed by the method is coated on a corresponding medium coating, although the thickness of the medium coating is only about 2mm, the thermal resistance value of the heat conduction blocking part of the medium coating is less than 0.04m2.K/W, the heat transfer loss of the surface coating to the interior of a wall body can be reduced, meanwhile, the medium coating also has extremely high light reflection and emittance, the performance sacrifice caused by insufficient construction thickness in the construction application process of the surface coating can be compensated, and the performance realization of the whole coating system is ensured.
Further, the auxiliary agents in the middle coating scheme comprise dispersing agents, wetting agents, thickening agents, defoaming agents, preservatives, pH regulators and film-forming auxiliary agents.
Preferably, the solution comprises 0.3-1.0 part of dispersant, 0.1-0.8 part of wetting agent, 0.5-2.0 parts of thickener, 0.2-0.5 part of defoamer, 0.2-0.4 part of preservative, 0.1-0.3 part of pH regulator and 0-2 parts of film-forming additive.
In the formed auxiliary agent, the synergistic effect of the dispersing agent, the wetting agent and the thickening agent can solve the problem of wetting and dispersing of the aerogel powder in an aqueous system, and the addition amount of the film-forming auxiliary agent is added according to the type and the addition amount of the used binder. Thereby being capable of forming a good synergistic effect with the aerogel.
The binder in the middle coating scheme comprises one or more of organic high molecular polymer styrene-acrylic emulsion, pure acrylic emulsion, VAE emulsion, high molecular polymer and inorganic binder silica sol, potassium water glass and lithium water glass. Wherein, the organic high molecular polymer styrene-acrylic emulsion has good early water resistance, high rigid strength of a paint film, good flexibility of the pure acrylic emulsion, good adhesive force of the VAE emulsion and good flame resistance of the inorganic adhesive, and can be selected and compounded according to different requirements.
The light filler in the middle coating scheme is preferably one or more of light calcium carbonate, talcum powder and mica powder. The addition of the light filler can further reduce the specific gravity of the dry film, reduce the heat conductivity coefficient and reduce the cost.
Aiming at the aerogel thermal insulation thick middle coating, the preparation method can be completed through the following steps:
firstly, preparing a slurry of silica aerogel;
adding water and the slurry of the silicon dioxide aerogel into a slurry type paint mixing kettle, uniformly stirring, adding the light filler and the binder, and uniformly stirring again;
thickeners and pH adjusters are used to adjust the viscosity and pH to the appropriate range.
It should be noted here that, when the slurry of silica aerogel is prepared, water and the auxiliary agent (as above) are added in the processing equipment in proportion, stirring is stopped after uniform stirring, and after the aerogel powder in corresponding proportion is added, stirring is performed at low speed until the aerogel powder is melted into a paste, and then stirring is performed for 5-10 minutes, so as to form the corresponding slurry of silica aerogel.
The aerogel heat insulation finish paint in the scheme of the heat insulation coating system comprises the following components in parts by weight:
the aerogel in this scheme is nanometer silica aerogel.
The auxiliary agent in the scheme comprises a dispersing agent, a wetting agent, a thickening agent, a defoaming agent, a preservative, a pH regulator, a film-forming auxiliary agent and an antifreeze agent.
Preferably, the auxiliary agent comprises 0.6-1.5 parts of dispersing agent, 0.3-1.0 part of wetting agent, 0.3-0.6 part of thickening agent, 0.3-1.2 parts of defoaming agent, 0.2-0.4 part of preservative, 0.1-0.3 part of pH regulator, 1-2 parts of film-forming auxiliary agent and 1-2 parts of antifreeze agent.
In the formed auxiliary agent, the synergistic effect of the dispersing agent, the wetting agent and the thickening agent can solve the problem of wetting and dispersing of the aerogel powder in an aqueous system, and the addition amount of the film-forming auxiliary agent is determined according to the type and the addition amount of the used bonding agent. Therefore, the composite material can well form a synergistic effect with aerogel, can be fully dispersed, and can prevent other substances from entering holes of the composite material, so that the overall heat insulation performance of the finally formed heat insulation coating is not affected.
The organic polymer emulsion in the heat-insulating finish paint scheme comprises one or more of styrene-acrylic emulsion, pure acrylic emulsion, silicone-acrylic emulsion and fluorocarbon emulsion. The emulsion can effectively improve the water resistance, the light resistance and the stain resistance of the heat-insulating finish paint.
The filler in the heat-insulating finish paint scheme comprises one or more of heavy calcium carbonate, calcined kaolin, water-washed kaolin and diatomite.
The filler is added into the heat-insulating finish paint, so that the fullness of a paint film can be effectively increased, and the cost can be effectively reduced.
Aiming at the aerogel heat-insulation finish paint, the scheme further provides a preparation method. The preparation method can be specifically completed through the following steps:
adding water into a dispersion kettle in proportion, and adding a dispersing agent, a wetting agent, 80% of a thickening agent, a defoaming agent and a preservative while stirring;
after stirring uniformly, adding rutile titanium dioxide and a filler, dispersing at a high speed for 20-30 minutes, adding slurry formed by aerogel, and dispersing at a medium speed for 10-20 minutes;
adding an antifreeze agent into the high-molecular emulsion, uniformly mixing, adding a film-forming auxiliary agent, uniformly mixing again, and putting into a dispersion kettle for stirring at a low speed for 10 minutes;
finally, the viscosity and pH are adjusted to the appropriate range using the remaining thickener and pH adjuster.
The aerogel heat insulation thick middle coating and the aerogel heat insulation finish coat which are formed by the components according to the corresponding proportion form a corresponding aerogel heat insulation coating system for buildings, and the heat insulation coating system mainly takes aerogel as functional powder and has the performance of blocking solar radiation and heat conduction; the heat-insulating coating has the heat-insulating function, and meanwhile, the elastic property can greatly improve the anti-cracking capability of the outer wall, so that the phenomena of leakage and the like of the conventional outer wall heat-insulating coating can be effectively improved.
The heat insulation coating system mainly uses aerogel as functional powder, the aerogel contains a large amount of air, the hole linearity is in the range of l-l00 nanometers, the heat insulation coating system is obviously different from porous materials with hole structures in the micron and millimeter magnitudes, the fine nanometer structures of the heat insulation coating system enable the thermal conductivity of the materials to be extremely low, and the heat insulation coating system has extremely large specific surface area. Therefore, the heat insulation coating system taking the aerogel as the functional powder has low heat conduction and extremely high reflection to sunlight and medium and far infrared high emission performance, so that the heat insulation coating system has double effects of heat insulation and heat preservation simultaneously in practical application, can play a role in heat insulation in summer, and can play a role in heat preservation in winter in severe cold or cold regions.
Moreover, the heat insulation coating system is very convenient for later-stage coating based on the superior performance of the heat insulation coating system. By way of example, a coating process for the present thermal insulation coating system is provided herein.
The coating process here is three stages:
1. and (3) treating the base surface, scraping the base surface batch with matched flexible putty, and drying to obtain a smooth surface without cracking.
2. The matched heat-insulating primer is coated, and after a paint film is formed and dried, the paint film is smooth and has no crack, and the adhesive force meets the requirement.
3. And (3) coating the aerogel heat insulation thick floating coat in batches for 1 time, pressing the aerogel heat insulation thick floating coat into the mesh cloth when the aerogel heat insulation thick floating coat is wet, and flattening the aerogel heat insulation thick floating coat when the aerogel heat insulation thick floating coat is wet.
4. Leveling the aerogel thermal insulation thick middle coating to a design thickness of more than 2mm, wherein the construction interval time of the two aerogel thermal insulation thick middle coatings is determined according to the temperature and humidity of the environment and is not suitable to be less than 24 hours.
3. And 2 times of painting heat-insulating finish paint, wherein the thickness of a dry film is 60-80 um, the surface of the paint film is flat and has no sagging, the covering power and the adhesive force meet the requirements, and each painting can be carried out after the surface of the previous painting is dried.
From the above, the heat insulation coating system can be directly applied to the surface of putty, so that the heat insulation layer can be thinned or even removed, the dead weight of attachments on the outer layer of the wall body is reduced, the whole manual construction time and cost are reduced, the risk of high-altitude falling is greatly reduced, meanwhile, the water seepage phenomenon is improved, the heat insulation capacity of the wall body is kept for a long time, the repair is easy, and the problem that the effect of common heat insulation is weakened along with the time is greatly improved.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer.
Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
Example 1
The aerogel thermal insulation coating system for buildings given in the example is mainly formed by an aerogel thermal insulation thick middle coating and an aerogel thermal insulation finish coating.
The aerogel heat insulation thick middle coating in the heat insulation coating system comprises the following components in parts by weight:
wherein, the aerogel is nano silicon dioxide aerogel.
The auxiliary agent comprises the following components in parts by weight:
0.3 part of dispersant, 0.1 part of wetting agent, 0.5 part of thickener, 0.2 part of defoamer, 0.2 part of preservative, 0.1 part of pH regulator, 1 part of film forming additive and 0.6 part of antifreeze.
The aerogel heat insulation finish paint in the scheme of the heat insulation coating system comprises the following components in parts by weight:
wherein the aerogel is nano silicon dioxide aerogel.
The auxiliary agent comprises the following components in parts by weight:
0.6 part of dispersant, 0.3 part of wetting agent, 0.3 part of thickener, 0.3 part of defoamer, 0.2 part of preservative, 0.1 part of pH regulator, 2 parts of film forming additive and 1.2 parts of antifreeze.
The thermal insulation coating system for buildings is formed based on the aerogel thermal insulation thick intermediate coat and the aerogel thermal insulation finish coat, and the process is as described above and is not described herein.
Wherein, the intermediate coat dry film that aerogel thermal insulation thick matter intercoat formed is 2 millimeters thick, and aerogel thermal insulation finish paint forms the top coat and this top coat dry film thickness is 60 microns.
The aerogel thermal insulation coating system for buildings thus prepared passes the following tests:
1. the technical requirements on solar light reflectance, near infrared reflectance and hemispherical emissivity in JG/T235-2014 reflective and heat-insulating coating for buildings are met, and the requirement on heat insulation temperature difference is increased according to a JG/T402-2013 heat-reflective metal roof board. The heat insulation temperature difference of the front surface and the back surface is more than or equal to 11 ℃. All of which meet and far exceed the specifications set by the relevant standards.
2. Other basic properties of the coating completely meet the relevant requirements of GB/T9755.
Therefore, the aerogel heat insulation coating system for the building provided by the embodiment has double effects of heat insulation and heat preservation, can effectively make up the limitation of the application range of the existing reflective heat insulation coating for the building, and fully covers the application area and the application season. This aerogel heat insulation coating system for building can satisfy general energy-conserving demand in the cold area of hot summer winter and hot summer winter, can form a complete set tradition in cold areas and keep warm and use, can reduce the thickness of traditional heat preservation, increases the security.
Example 2
The aerogel thermal insulation coating system for buildings given in the example is mainly formed by an aerogel thermal insulation thick middle coating and an aerogel thermal insulation finish coating.
The aerogel heat insulation thick middle coating in the heat insulation coating system comprises the following components in parts by weight:
wherein, the aerogel is nano silicon dioxide aerogel.
The auxiliary agent comprises the following components in parts by weight:
0.6 part of dispersant, 0.5 part of wetting agent, 0.2 part of thickener, 0.4 part of defoamer, 0.3 part of preservative, 0.2 part of pH regulator, 1.5 parts of film forming additive and 0.7 part of antifreeze.
The aerogel heat insulation finish paint in the scheme of the heat insulation coating system comprises the following components in parts by weight:
wherein the aerogel is nano silicon dioxide aerogel.
The auxiliary agent comprises the following components in parts by weight:
1.0 part of dispersant, 0.6 part of wetting agent, 0.4 part of thickener, 0.8 part of defoamer, 0.3 part of preservative, 0.2 part of pH regulator, 1.5 parts of film forming additive and 1.5 parts of antifreeze.
The thermal insulation coating system for buildings is formed based on the aerogel thermal insulation thick intermediate coat and the aerogel thermal insulation finish coat, and the process is as described above and is not described herein.
Wherein, the intermediate coat dry film that aerogel thermal insulation thick matter intercoat formed is 2 millimeters thick, and aerogel thermal insulation finish paint forms the top coat and this top coat dry film thickness is 60 microns.
The aerogel thermal insulation coating system for buildings thus prepared passes the following tests:
1. the technical requirements on solar light reflectance, near infrared reflectance and hemispherical emissivity in JG/T235-2014 reflective and heat-insulating coating for buildings are met, and the requirement test method for increasing the heat-insulating temperature difference is performed according to JG/T402-2013 heat-reflecting metal roof boards; the heat insulation temperature difference of the front surface and the back surface is more than or equal to 18 ℃. All of which meet and far exceed the specifications set by the relevant standards.
2. Other basic properties of the coating completely meet the relevant requirements of GB/T9755.
Therefore, the aerogel heat insulation coating system for the building provided by the embodiment has double effects of heat insulation and heat preservation, can effectively make up the limitation of the application range of the existing reflective heat insulation coating for the building, and fully covers the application area and the application season.
This aerogel heat insulation coating system for building can satisfy general energy-conserving demand in the cold area of hot summer winter and hot summer winter, can form a complete set tradition in cold areas and keep warm and use, can reduce the thickness of traditional heat preservation, increases the security.
Example 3
The aerogel thermal insulation coating system for buildings given in the example is mainly formed by an aerogel thermal insulation thick middle coating and an aerogel thermal insulation finish coating.
The aerogel heat insulation thick middle coating in the heat insulation coating system comprises the following components in parts by weight:
wherein, the aerogel is nano silicon dioxide aerogel.
The auxiliary agent comprises the following components in parts by weight:
0.9 part of dispersant, 0.7 part of wetting agent, 1.8 parts of thickening agent, 0.5 part of defoaming agent, 0.4 part of preservative, 0.3 part of pH regulator and 1.9 parts of film-forming assistant.
The aerogel heat insulation finish paint in the scheme of the heat insulation coating system comprises the following components in parts by weight:
wherein the aerogel is nano silicon dioxide aerogel.
The auxiliary agent comprises the following components in parts by weight:
1.4 parts of dispersant, 0.8 part of wetting agent, 0.6 part of thickening agent, 1.2 parts of defoaming agent, 0.4 part of preservative, 0.3 part of pH regulator, 2 parts of film-forming assistant and 2 parts of antifreeze.
The thermal insulation coating system for buildings is formed based on the aerogel thermal insulation thick intermediate coat and the aerogel thermal insulation finish coat, and the process is as described above and is not described herein.
Wherein, the intermediate coat dry film that aerogel thermal insulation thick matter intercoat formed is 2 millimeters thick, and aerogel thermal insulation finish paint forms the top coat and this top coat dry film thickness is 60 microns.
The aerogel thermal insulation coating system for buildings thus prepared passes the following tests:
1. the technical requirements on solar light reflectance, near infrared reflectance and hemispherical emissivity in JG/T235-2014 reflective and insulating coating for buildings are met, and the requirement test method for increasing the insulating temperature difference is carried out according to JG/T402-2013 thermal reflection metal roof boards; the heat insulation temperature difference of the front surface and the back surface is more than or equal to 18 ℃; all of which meet and far exceed the specifications set by the relevant standards.
2. Other basic properties of the coating completely meet the relevant requirements of GB/T9755.
Therefore, the aerogel heat insulation coating system for the building provided by the embodiment has double effects of heat insulation and heat preservation, can effectively make up the limitation of the application range of the existing reflective heat insulation coating for the building, and fully covers the application area and the application season.
This aerogel heat insulation coating system for building can satisfy general energy-conserving demand in the cold area of hot summer winter and hot summer winter, can form a complete set tradition in cold areas and keep warm and use, can reduce the thickness of traditional heat preservation, increases the security.
Comparative example 1
This example shows a common reflective insulation coating for buildings, which has the following formulation:
the dry film thickness of the coating formed based on the reflective thermal insulating coating is 150 micrometers.
Comparison of tests
See table 1 for results of multiple performance tests on 4 products obtained from examples 1, 2, 3 and comparative example 1.
TABLE 1
| Item | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| Solar reflectance | 0.87 | 0.91 | 0.92 | 0.84 |
| Near infrared reflectance | 0.88 | 0.90 | 0.92 | 0.85 |
| Thermal insulation temperature difference | 11 | 18 | 25 | 4 |
According to the test results given in table 1, the aerogel thermal insulation coating given by the example of the invention is obviously superior to the existing reflective thermal insulation coating in the aspects of solar light emission ratio, near infrared reflectance and thermal insulation temperature difference.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (16)
1. The aerogel thermal insulation thick middle coating is characterized by comprising the following components in parts by weight:
2. the aerogel thermal insulation thickest floating coat according to claim 1, wherein the aerogel is a nanosilica aerogel.
3. The aerogel insulation blanket of claim 1 wherein the adjuvants comprise dispersants, wetting agents, thickeners, defoamers, preservatives, pH adjusters, film forming adjuvants.
4. The aerogel thermal insulation thick middle coating as claimed in claim 3, wherein the dispersing agent is 0.3-1.0 part, the wetting agent is 0.1-0.8 part, the thickening agent is 0.5-2.0 parts, the defoaming agent is 0.2-0.5 part, the preservative is 0.2-0.4 part, the pH regulator is 0.1-0.3 part, and the film forming aid is 0-2 parts.
5. The aerogel thermal insulation heavy middle coating according to claim 1, wherein the binder comprises one or more of organic high molecular polymer styrene-acrylic emulsion, pure acrylic emulsion, VAE emulsion, high molecular polymer, inorganic binder silica sol, potassium water glass and lithium water glass.
6. The aerogel thermal insulation thick middle coating according to claim 1, wherein the light filler is one or more of light calcium carbonate, talcum powder and mica powder.
7. A preparation method of aerogel thermal insulation thick floating coat is characterized by comprising the following steps:
preparing a slurry of silica aerogel;
adding water and the slurry of the silicon dioxide aerogel into a slurry type paint mixing kettle in proportion, uniformly stirring, adding the light filler and the binder, and uniformly stirring again;
thickeners and pH adjusters are used to adjust the viscosity and pH to the appropriate range.
8. The method for preparing a slurry of silica aerogel according to claim 7, wherein the method comprises adding water and the auxiliary agent into the processing equipment in proportion, stirring uniformly, stopping stirring, adding the aerogel powder, stirring at a low speed until the aerogel powder is melted into a paste, and stirring for 5-10 minutes.
9. The aerogel heat-insulating finish paint is characterized by comprising the following components in parts by weight:
10. the aerogel thermal insulation topcoat as claimed in claim 9, wherein the aerogel is a nanosilica aerogel.
11. The aerogel thermal insulation topcoat of claim 9, wherein the additives comprise dispersants, wetting agents, thickeners, defoamers, preservatives, pH adjusters, film forming aids, and anti-freeze agents.
12. The aerogel thermal insulation finishing paint of claim 11, wherein the dispersing agent is 0.6-1.5 parts, the wetting agent is 0.3-1.0 part, the thickening agent is 0.3-0.6 part, the defoaming agent is 0.3-1.2 parts, the preservative is 0.2-0.4 part, the pH regulator is 0.1-0.3 part, the film forming additive is 1-2 parts, and the anti-freezing agent is 1-2 parts.
13. The aerogel thermal insulation finishing coat of claim 9, wherein the organic polymer emulsion comprises one or more of styrene-acrylic emulsion, silicone-acrylic emulsion and fluorocarbon emulsion.
14. The aerogel thermal insulation topcoat of claim 9, wherein the filler comprises one or more of ground calcium carbonate, calcined kaolin, washed kaolin, diatomaceous earth.
15. The preparation method of the aerogel heat-insulation finish paint is characterized by comprising the following steps:
adding water into a dispersion kettle in proportion, and adding a dispersing agent, a wetting agent, a part of thickening agent, a defoaming agent and a preservative while stirring;
after stirring uniformly, adding titanium dioxide and filler, dispersing at a high speed for 20-30 minutes, adding slurry formed by aerogel, dispersing at a medium speed for 10-20 minutes, adding high-molecular emulsion, and stirring at a low speed for 10 minutes;
finally, the viscosity and pH are adjusted to the appropriate range using the remaining thickener and pH adjuster.
16. An aerogel thermal insulation and heat preservation coating system for buildings, which is characterized by comprising the aerogel thermal insulation thick middle coating of any one of claims 1 to 6 and the aerogel thermal insulation top coating of any one of claims 9 to 14, wherein the dry film thickness of the middle coating is more than 1 mm, and the dry film thickness of the top coating is more than 60 microns.
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| CN115029035A (en) * | 2022-06-08 | 2022-09-09 | 广州大学 | Ultrahigh-performance aerogel composite heat-insulating coating and preparation method thereof |
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| CN115029035A (en) * | 2022-06-08 | 2022-09-09 | 广州大学 | Ultrahigh-performance aerogel composite heat-insulating coating and preparation method thereof |
| CN115160839A (en) * | 2022-08-12 | 2022-10-11 | 同济大学 | Aerogel modified regenerated powder inorganic heat-insulating coating and preparation method thereof |
| CN115846177A (en) * | 2022-12-28 | 2023-03-28 | 东营富勤工贸有限公司 | Novel crude oil storage tank aerogel heat preservation system |
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